Airport Express: can it do this?

I have a Airport extreme network running, can i use it to extend, add a ethernet port for people to plug into, and run music through it, all at the same time.(well maybe not same time but without changing things)

I would expect it can just want to be sure before i pick one up. I would love to have fast answers because i want to use that sale.....
Thanks

That's what I'm doing. I have an Airport Extreme basestation for my home network, and added last year an Express which is hooked up to our Bose home theater speakers to stream music to, and have a USB cable connecting the Express to my ReplayTV DVR.

I know alot of people use it to connect to their PS2's or xbox's. Works perfectly.

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